| OW | once weekly; open wedge; outer wall; oval window |
|---|---|
| DOTC | Dameshek's oval target cell |
| OTC | ornithine transcarbamylase; oval target cell; over-the-counter; oxytetracycline |
| RW | radiological warfare; ragweed; respiratory work; Romano-Ward [syndrome]; round window |
| SPW | subxiphoid pericardial window |